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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Opinions wanted, or facts...About 6.5x284 or 260 barrel life
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<blockquote data-quote="Bart B" data-source="post: 650888" data-attributes="member: 5302"><p>OK, I have no problem admitting I'm me. I did that thread years ago when I did engineering and documentation work at Hewlett-Packard. </p><p></p><p>One thing I should comment on is that rapid firing problably doesn't cause as much acceleration in barrel wear as excessive peak pressure does. Boots Obermeyer (barrel maker par excellence!) gave me some interesting data that backs that up. He claimed that all those hot-rodders loading ammo to pressures far above the 55,000 CUP range do far more damage fire cracking the rifling's leade such that bullets really get unbalanced in their first inch of travel down the bore.</p><p></p><p>My formula doesn't work for .22 rimfire cartridges. Before the mid 1980's when all the factories changed their priming mixture formula, folks shooting the best scores in competition got 50,000 to 60,000 rounds of 1/2 MOA accuracy at 100 yards with their standard velocity .22 long rifle match ammo. A deadly explosion at Eley's plant in Great Britian caused priming mixtures to change and have more glass frit as the filler. The new mixture caused more throat erosion (and less accuracy) and barrel life's been about 30,000 rounds since. And virtually all the records set before then still stand as it's virtually impossible nowadays go get ammo that'll shoot under 3/4 MOA at a hunderd.</p></blockquote><p></p>
[QUOTE="Bart B, post: 650888, member: 5302"] OK, I have no problem admitting I'm me. I did that thread years ago when I did engineering and documentation work at Hewlett-Packard. One thing I should comment on is that rapid firing problably doesn't cause as much acceleration in barrel wear as excessive peak pressure does. Boots Obermeyer (barrel maker par excellence!) gave me some interesting data that backs that up. He claimed that all those hot-rodders loading ammo to pressures far above the 55,000 CUP range do far more damage fire cracking the rifling's leade such that bullets really get unbalanced in their first inch of travel down the bore. My formula doesn't work for .22 rimfire cartridges. Before the mid 1980's when all the factories changed their priming mixture formula, folks shooting the best scores in competition got 50,000 to 60,000 rounds of 1/2 MOA accuracy at 100 yards with their standard velocity .22 long rifle match ammo. A deadly explosion at Eley's plant in Great Britian caused priming mixtures to change and have more glass frit as the filler. The new mixture caused more throat erosion (and less accuracy) and barrel life's been about 30,000 rounds since. And virtually all the records set before then still stand as it's virtually impossible nowadays go get ammo that'll shoot under 3/4 MOA at a hunderd. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Opinions wanted, or facts...About 6.5x284 or 260 barrel life
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